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Reil [10]
3 years ago
12

How many valence electrons are there in Se atom?

Chemistry
2 answers:
a_sh-v [17]3 years ago
7 0

Answer:

The numer of valence electrons is defined as the number of electrons present in the outer most shell of the atom.So, in the case if selenium, there are 6.

Lena [83]3 years ago
5 0

Answer:

4 valence electrons

Despite the fact that the word silicon has a ubiquitous affiliation with all things electronic, Si itself is not a good electrical conductor. It has 4 valence electrons, meaning that filling its outer shell it can form a very strong lattice with 4 neighboring Si atoms-with no un-bonded electrons remaining

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The molar mass of Cr(OH)2 is:
son4ous [18]

The molar mass of Cr(OH)_2 is 86.02 g/mole .

<h3><u> Explanation:</u> </h3>

The molar mass of a chemical compound is represented as the mass of a unit of that compound separated by the number of substances in that unit, measured in moles. The molar mass is a volume, not molecular, the property of a substance.

The molar mass is a percentage of various examples of the compound, which usually change in mass due to the appearance of isotopes.

From the below attached table, the Molar mass of Cr(OH)_2 is 86.0108 g/mol.

3 0
3 years ago
4L of a gas is contained at 300kpa and 200k.what’s wills it’s volume be in L at 140 kpa and 100k
Rashid [163]
The answer is 4.3L just took the quiz
6 0
3 years ago
if 66.38 g of potassium chloride reacts with fluorine and produces potassium fluoride and chlorine how many moles of chlorine ca
Ann [662]

Taking into account the reaction stoichiometry, f 66.38 g of potassium chloride reacts with fluorine and produces potassium fluoride and chlorine, 0.4452 moles of chlorine is produced.

<h3>Reaction stoichiometry</h3>

In first place, the balanced reaction is:

2 KCl + F₂ → 2 KF + Cl₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

  • KCl: 2 moles
  • F₂: 1 mole
  • KF: 2 moles
  • Cl₂: 1 mole

The molar mass of the compounds is:

  • KCl: 74.55 g/mole
  • F₂: 38 g/mole
  • KF: 58.1 g/mole
  • Cl₂: 70.9 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

  • KCl: 2 moles ×74.55 g/mole= 149.1 grams
  • F₂: 1 mole ×38 g/mole= 38 grams
  • KF: 2 moles ×58.1 g/mole= 116.2 grams
  • Cl₂: 1 mole ×70.9 g/mole= 70.9 grams

<h3>Moles of Cl₂ formed</h3>

The following rule of three can be applied: if by reaction stoichiometry 149.1 grams of KCl form 1 mole of Cl₂, 66.38 grams of KCl form how many moles of Cl₂?

amount of moles of Cl_{2} =\frac{66.38 grams of KClx1 mole of Cl_{2}}{149.1 grams of KCl}

<u><em>amount of moles of Cl₂= 0.4452 moles</em></u>

Then, if 66.38 g of potassium chloride reacts with fluorine and produces potassium fluoride and chlorine, 0.4452 moles of chlorine is produced.

Learn more about the reaction stoichiometry:

<u>brainly.com/question/24741074</u>

<u>brainly.com/question/24653699</u>

5 0
2 years ago
Explain how understanding this relaship can help desighn more efficient technologist
Vikentia [17]

Metals are good conductor of electricity, because as per there structure they have free electrons which help them to move freely within the metal thus helps to maintain a good flow of electricity.

This theory has really helped engineers especially for making powerful batteries. As good batteries means amount of electricity drawn from it will be great and that too for longer time.

Hence such metals are used to make batteries that has more number of free electrons and thus can contribute to generate more electricity.

6 0
3 years ago
What part of the plant is fertilized with pollen to produce seeds?
Oksanka [162]
Ovule pistil has the pollen
7 0
3 years ago
Read 2 more answers
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